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.help sub1 Apr 2004WCSTools
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NAME
sub1 -- Find USNO-B1.0 Catalog stars in a square or circle on the sky
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USAGE
sua2 [options] ra dec system
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ARGUMENTS
.ls -a
list single closest catalog source
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.ls -b
Output B1950 (FK4) coordinates
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.ls -d
Sort by distance from center instead of flux
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.ls -e
Output ecliptic coordinates
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.ls -f
Output search center for other programs
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.ls -g
Output galactic coordinates
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.ls -h
Print heading, else do not 
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.ls -i
Print catalog object name, not catalog number (=ua2_region_number)
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.ls -j
Output J2000 (FK5) coordinates
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.ls -l
Print center and closest star on one line
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.ls -m [<bright magnitude>] <faint magnitude>
Limiting catalog magnitude(s) (default none, bright -2 if only faint is given)
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.ls -n <num>
Number of brightest stars to print 
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.ls -o <name>
Object name used to name output file
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.ls -p
Sort by distance from search center instead of brightness
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.ls -q <years>
Equinox of output positions in years
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.ls -r <radius>
Search box half-width in arcsec or dd:mm:ss
If negative, this is a radius; if two numbers, first is in right ascension,
second is in declination. (default is 10, that is a 20x20 arcsec box)
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.ls -s
Sort by right ascension instead of flux 
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.ls -t
Tab table output
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.ls -u <num>
Print X Y instead of number in front of non-tab entry
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.ls -v
Verbose listing of processing intermediate results
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.ls -w
Write tab table output file imagename.uac
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.ls -y
Epoch of output positions in years
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.ls minid=number
If the object is found on fewer than this many plates, where the range
is 2-5, it is left off the list. All Tycho-2 stars, where the catalog
value of this number is set to zero, are included unless number is
negated. The default value set in the file libwcs/ubcread.c is 0. For
the most accurate positions, use minid=4.
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.ls minpmqual=number
If the proper motion quality flag is less than this number, proper
motion is never added to the catalog position. The range is 1-9 from
the catalog, or 10 if the proper motion is from the Tycho-2 Catalog.
Setting this to 11 will never add proper motion. The default value set
in the file libwcs/ubcread.c is 3. For the best proper motions, use
minpmqual=9.
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DESCRIPTION
.I sub1
finds all of the U.S. Naval Observatory B1.0 Catalog objects in a specified
region of the sky and lists their sky positions and magnitudes in order of
brightness. Output is to standard out, unless the -w flag is set, in which
case it goes to objectname.uac or search.uac. It is a link to scat.
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WEB PAGE
http://tdc-www.harvard.edu/software/wcstools/scat/sub1.html
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SEE ALSO
scat, imcat, imub1
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AUTHOR
Doug Mink, SAO (dmink@cfa.harvard.edu)
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